All connections between stack ports must be directly between switches. A stacking connection cannot
pass through a third device, for example a Virtual Port Extender or an LRM/MACsec Adapter.
It is essential to create an unbroken data path through all the switches in the stack.
Use SummitStack-V160 Stacking
A stacking rate of 160 Gbps can be achieved using certain configurations of Extreme Networks
switches. For example, an X460-G2 switch can be connected to an X670-G2-48x-4q switch through
40-Gbps stacking connections that provide 160 Gbps full-duplex bandwidth. This connection is
performed using the VIM-2q module in the X460-G2 switch and the QSFP+ ports on the X670-
G2-48x-4q switch.
Examples of Valid Stacking Configurations
The examples in the following sections show various physical stacking arrangements: all switches in a
single rack, switches in two adjacent racks, and switches at the tops of several racks in a row.
Example: Basic Stack with Four Switches
This example shows a stack of four switches in a single rack.
The slot numbers presume a console connection to the switch at the top of the physical stack.
shows cable connections for a 4-node stack using SummitStack 40G cables to connect
switches with integrated SummitStack ports.
Slot 1
Slot 2
Slot 3
Slot 4
Figure 24: SummitStack Cable Connections Using Four Switches with Integrated SummitStack Ports
lists the recommended order for connecting the stacking ports in this example.
Table 10: Basic Stack with Four Switches: Connections
Connect this slot and port . . .
. . . To this slot and port
Slot 1
Stack Port 2
Slot 2
Stack Port 1
Slot 2
Stack Port 2
Slot 3
Stack Port 1
Slot 3
Stack Port 2
Slot 4
Stack Port 1
Slot 4
Stack Port 2
Slot 1
Stack Port 1
Connect the Switches to Form the Stack Ring
Build Stacks
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ExtremeSwitching 5320 Series Hardware Installation Guide
